Method of treating objects the surface of which consists of tin

Details Method of treating objects the surface of which consists of tin Method of treating objects the surface of which consists of tin

C - Chemistry, Metallurgy

25

D

204/83

C25D 3/30 (2006.01) C25D 5/18 (2006.01) C25D 9/04 (2006.01) C25D 11/34 (2006.01)

Patent

CA 1152938

ABSTRACT OF THE DISCLOSURE Treating objects of which at least the surface consists of tin in order to obtain a satisfactory corrosion resistance. To this end, the objects are subjected, in a tungstate solution of at least 0.02 M and having a pH of 4-11, alternately to a cathodic and an anodic polarity (so-called periodically reversed current). The frequency with which the current reverses being 0.2-2 Hz and the absolute value of the current density being 0.2-1 A/dm2, the ratio of the anodic to the cathodic density being from 0.5-1.

358937

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